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For a basic static site, save your HTML and CSS files, then open the HTML file in a browser. Double-click it, drag it into a browser window, or use the browser’s File > Open command. A correctly linked stylesheet will render automatically. If your page uses JavaScript requests, server-side code, or resources blocked by file:// security rules, serve the folder over HTTP and open its localhost address instead.
1. Open a basic HTML page directly
Create a project folder containing an HTML file and, if needed, a CSS file:
my-site/
├── index.html
└── styles.cssIn index.html, link the stylesheet with a relative path:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Preview page</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<h1>Hello, browser</h1>
</body>
</html>- Save both files in the same folder.
- Double-click
index.htmlto open it in your default browser. - Alternatively, drag the file into Chrome, Edge, Firefox, or another browser window.
- Use the browser’s File > Open command and select the file.
These direct-opening methods are the normal starting point for a page made only of local HTML, CSS, images, and straightforward client-side JavaScript. MDN documents the same workflow in its local testing server guide.
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How the CSS link is resolved
The browser resolves href="styles.css" relative to the HTML file’s folder. If the stylesheet is in a subfolder, use its path:
<link rel="stylesheet" href="css/styles.css">A stylesheet in the parent folder requires:
<link rel="stylesheet" href="../styles.css">File and folder names must match, including capitalization on case-sensitive systems. A leading slash such as /styles.css means the root of the current host; it usually does not point to a file beside a file:// document.
2. Refresh after editing
After changing HTML or CSS, save the file and reload the browser tab. Use the normal reload button first. If an old stylesheet remains visible, perform a hard reload from the browser’s developer-tools menu; this bypasses more cached resources.
For a quick styling experiment, open developer tools, select an element, and edit a CSS declaration in the Styles pane. The change appears immediately but is temporary. Copy the final declaration into your source stylesheet and save it. MDN explains how developer tools expose the runtime DOM and applied and computed CSS in its developer-tools guide.
3. Preview from VS Code
VS Code supports local HTML workflows beside your source files. Open the project folder in VS Code, then use the Explorer or editor context menu for the HTML file to open it in the integrated browser. When an HTML file is active, the Show Preview action can display the page and update it as you edit, according to the VS Code HTML documentation.
There are two behaviors to distinguish:
- Local-file preview: the document is opened with a local
file://URL. - Localhost preview: the integrated browser navigates to an HTTP address provided by a server you run.
VS Code’s integrated browser can navigate to local files and HTTP(S) pages, but opening local HTML is unavailable for remote or virtual workspace resources. Its documented workflow is covered in the integrated browser documentation.
4. When to use a local HTTP server
Direct opening is not a requirement for every static example. Use a server when the page needs HTTP semantics or when the browser blocks behavior under file://. Typical cases include:
- Asynchronous requests:
fetch()or XMLHttpRequest calls to local files can be rejected by cross-origin rules. - Server-side code: PHP, Python, Node, or another server runtime must execute on a server; a browser cannot run it by opening an HTML file.
- Module and resource restrictions: some JavaScript modules, fonts, images, or data files behave differently from a local file origin.
- Production-like testing: relative URLs, redirects, cookies, and request headers are easier to test over HTTP.
MDN’s local-server guide lists editor extensions and command-line options. Run the command from the folder that contains your HTML file.
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python -m http.serverThen visit http://localhost:8000. Python’s example uses port 8000 by default. To select another port:
python -m http.server 8080Stop the server with Ctrl+C.
Node.js
With Node.js installed, MDN documents the http-server approach. Install it once, then run it from your project directory:
npx http-serverOpen the localhost URL printed by the command. MDN’s example uses port 9999; the command output is authoritative if your installation chooses another available port.
Editor extensions
An editor extension can start a server and refresh the browser when files change. Treat the extension as a convenience layer: confirm which folder is being served and which localhost port it reports. If the browser shows an old page, check that its address points to the current project rather than another server.
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5. A practical preview decision
| Method | Use it when | Limit |
|---|---|---|
| Open the HTML file directly | Your page is a basic static document with local HTML and CSS. | file:// can restrict requests, server-side features, or local-resource access. |
| VS Code integrated preview or browser | You want the source and rendered page together while editing. | Local-file preview has remote and virtual workspace limits; behavior differs between file:// and localhost. |
| Local HTTP server | Your page needs fetch requests, modules, cookies, redirects, or server-side execution. | You must have Python, Node.js, or an editor server extension available. |
6. Fix a page that looks wrong
CSS is missing
- Confirm the
<link>element is inside<head>. - Compare the
hrefpath with the actual folder and filename. - Check capitalization and file extensions.
- Open developer tools and inspect the Network panel for a failed stylesheet request.
- Look for a syntax error or a later rule that overrides the declaration.
The page works on localhost but not when opened directly
This usually indicates a file-origin restriction or a dependency on server behavior. Keep using the local HTTP server and inspect the browser console for the blocked request. Do not “fix” the problem by disabling browser security for normal browsing.
The HTML renders but layout or colors are wrong
Inspect the affected element. The Styles pane shows matching rules and which declarations are overridden; the Computed pane shows the final values after inheritance and the cascade. Temporarily change a value there, then make the corresponding permanent edit in the source CSS.
Images or fonts do not load
Check each relative URL from the location of the CSS file, not the HTML file. For example, background-image: url("../images/hero.jpg") is resolved relative to the stylesheet’s directory. Also verify that the browser can read the file and that the server is returning the expected content type.
JavaScript errors stop the page
Read the first console error, note its file and line number, and fix that error before later messages. If a script expects an HTTP origin, test again through http://localhost rather than file://.
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Frequently Asked Questions
Can I preview HTML without installing a server?
Yes. Open the saved HTML file directly when the page is a simple static document. Install or run a local server only when the page’s requests or runtime require HTTP behavior.
Why does my CSS work in one folder but not another?
The stylesheet path is relative to the HTML document. Moving either file changes the relationship represented by the link, so update the path and check capitalization.
Is VS Code preview the same as running localhost?
No. VS Code can open a local file with a file:// URL or navigate to a server-provided localhost URL. Those origins have different browser security behavior.
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